CN103808248A - Large-span steel structure bridge resistance strain type safety detection device - Google Patents

Large-span steel structure bridge resistance strain type safety detection device Download PDF

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Publication number
CN103808248A
CN103808248A CN201310327293.XA CN201310327293A CN103808248A CN 103808248 A CN103808248 A CN 103808248A CN 201310327293 A CN201310327293 A CN 201310327293A CN 103808248 A CN103808248 A CN 103808248A
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CN
China
Prior art keywords
bridge
current
resistance strain
resistance
detection sensor
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Application number
CN201310327293.XA
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Chinese (zh)
Inventor
黄伟
徐礼明
Original Assignee
镇江市高等专科学校
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Application filed by 镇江市高等专科学校 filed Critical 镇江市高等专科学校
Priority to CN201310327293.XA priority Critical patent/CN103808248A/en
Publication of CN103808248A publication Critical patent/CN103808248A/en

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Abstract

The invention discloses a large-span steel structure bridge resistance strain type safety detection device which comprises a resistance strain gauge, a high-precision constant voltage power supply, a current detection sensor, a current sensor transmitter, an A/D conversion circuit, an embedded simple chip microcomputer system and a computer. The resistance strain gauge is formed by winding constantans in a grid mode and fixed on the surface of a bridge bearing main steel structure, the resistance strain gauge, the current detection sensor and the high-precision constant voltage power supply form a loop, the current detection sensor detects current in the loop, the current sensor transmitter converts the current into a standard signal, the standard signal is subjected A/D conversion by the A/D conversion circuit and then input the embedded simple chip microcomputer system, and the embedded simple chip microcomputer system is connected with the computer through a communication cable and transmits data to the computer. The large-span steel structure bridge resistance strain type safety detection device monitors the deformation degree of the bridge steel structure by detecting current change of the resistance strain gauge so as to avoid bridge accidents.

Description

Large-span steel bridge resistance-strain type safety detection device
Technical field
The present invention relates to a kind of safety detection device, relate in particular to a kind of large-span steel bridge resistance-strain type safety detection device, belong to checkout equipment technical field.
Background technology
Current Longspan Bridge mostly is steel construction, when Longspan Bridge more of a specified duration service time, because long-term load-carrying causes fatigue deformation, or because the distortion producing by the serious overload of vehicle of bridge, all likely cause the collapse accident of large-span steel bridge, the example of the security incident of this respect has much in actual life, in order to ensure the safety of large-span steel bridge, design a kind of device that detects large-span steel bridge use procedure generation deformation, avoid Bridge Accidents significant.
Summary of the invention
The object of the present invention is to provide a kind of large-span steel bridge resistance-strain type safety detection device, to bridge, long-term load-carrying causes fatigue deformation, or the distortion that the serious overload of vehicle produces detects, to avoid the generation of Bridge Accidents.
object of the present invention is achieved by the following technical programs:
A kind of large-span steel bridge resistance-strain type safety detection device, comprises resistance strain gage 1, high-accuracy and constant voltage source 2, current detection sensor 3, current sensor transmitter 4, A/D change-over circuit 5, embedded single-chip computer system 6, computing machine 7, described resistance strain gage 1 by the constantan of=0.02~0.05mm turns to palisade, be fixed on the surface of the main structure of steel product of bridge bearing, one end of described resistance strain gage 1 one termination high-accuracy and constant voltage sources 2, resistance strain gage 1 other end connects high-accuracy and constant voltage source 2 other end after connecting with current detection sensor 3 forms loop, described current detection sensor 3 detects electric current in loop, described current sensor transmitter 4 is connected with current detection sensor 3, the current transformation that current detection sensor 3 is detected becomes the standard signal of 0~10mA to be input to embedded single-chip computer system 6 after A/D change-over circuit 5 carries out A/D conversion, described embedded single-chip computer system 6 is connected by shielding type communication cable with computing machine 7, send data to computing machine 7.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is by detecting the variation of resistance strain gage electric current, and the variation range of known resistance strain gage resistance value, monitors large-span bridge steel malformation degree, to avoid the generation of Bridge Accidents.
Accompanying drawing explanation
Fig. 1 is system construction drawing of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
If bridge main steel construction is sectional making, strain gauge resistance sheet is made to the length identical with bridge main steel construction sectional making, each main steel construction segmented surface is fixed strain gauge resistance sheet; If bridge main steel construction is integral manufacturing, strain gauge resistance sheet is made 10 meters above to the identical length of bridge main steel construction, is fixed on the surface of the main structure of steel product of bridge bearing.10VDC high-accuracy and constant voltage source is offered to resistance strain gage.Resistance strain gage is based on strain effect, in the time that bridge causes that because of load-carrying fatigue or serious overload produce distortion more for a long time, be fixed on bridge bearing with the foil gauge of bridge main steel construction equal length and tie by steel, also deform simultaneously, will cause the variation of resistance strain gage resistance value.When bridge does not carry or has carrying and without when distortion, foil gauge resistance value is .Resistance strain gage is used herein the constantan of=0.02~0.05mm turns to palisade, the resistivity that is constantan is 0.48 m, the length that L is resistance wire, makes palisade, and total length is the length that bridge main steel construction is identical, if bridge main steel construction is sectional making, the length that each main steel construction segmented surface is fixed strain gauge resistance sheet; If bridge main steel construction is integral manufacturing, strain gauge resistance sheet is made 10 meters above to the identical length of bridge main steel construction, is fixed on the surface of the main structure of steel product of bridge bearing, and the section that S is resistance wire is long-pending.When bridge load-carrying produces distortion, resistance wire will extend l, cross-sectional area is corresponding to be reduced s, resistivity changes because lattice tissue deforms therefore resistance value changes, changing value is r:
λ: piezoresistance coefficient is relevant with material;
μ: the parameter of material, μ gets 0.3~0.5
E: the elastic modulus of material, material behavior
Visible, λ, μ, E are the relevant characteristics of material, and certain concrete material is constant when foil gauge shape does not change, and the resistance value of foil gauge is constant; When foil gauge shape changes, the variation of resistance will be caused.
When bridge produces distortion because load-carrying causes fatigue or serious overload more for a long time, when master bridge steel construction deforms, the resistance strain gage that is fixed on the main structure of steel product of bridge bearing surface also has identical variation with steel construction, and the resistance value of foil gauge changes.The variation of monitor strain sheet resistance value r, just can know the basic condition that Steel Bridge Structure is out of shape.If bridge main steel construction is sectional making, each main steel construction segmented surface is fixed strain gauge resistance sheet, all provides =+10VDC high-accuracy and constant voltage source; If bridge main steel construction is integral manufacturing, provide=+ 10VDC high-accuracy and constant voltage source of strain gauge resistance sheet is provided, because of supply voltage constant, according to Ohm law, generation current on resistance strain gage, because the electrical resistance bridge steel structure of foil gauge changes, resistance changes, electric current changes, by detecting the variation of electric current, known bridge steel structure deformation extent.By the data recording of current detecting, can monitor in real time current data, current data is undergone mutation, answer selective analysis; Also can carry out statistical study and technical Analysis to the current data of long-term collection, draw load situation and the tired trend of bridge steel structure of Longspan Bridge steel construction.
If bridge main steel construction is sectional making, each main steel construction segmented surface is fixed strain gauge resistance sheet; If bridge main steel construction is integral manufacturing, the resistance strain gage of the length identical with bridge main steel construction all seals making, provides the power supply wiring sectional area of=+ 10VDC high-accuracy and constant voltage source is 2.5mm 2~4 mm 2, resistance strain gage and necessary firm welding of being connected of wire, guarantee that conductor resistance and street corner Resistance Influence are enough little.
As shown in Figure 1, if bridge main steel construction is sectional making, each main steel construction segmented surface is fixed strain gauge resistance sheet, all provides =+10VDC high-accuracy and constant voltage source; If bridge main steel construction is integral manufacturing, provide to strain gauge resistance sheet =+10VDC high-accuracy and constant voltage source.Each main steel construction segmented surface is fixed strain gauge resistance sheet to be provided =+10VDC high-accuracy and constant voltage source.Herein, be simplified illustration, only detect loop with one and represent in the drawings, the structure in each loop is identical.Large-span steel bridge resistance-strain type safety detection device comprises resistance strain gage 1, high-accuracy and constant voltage source 2, current detection sensor 3, current sensor transmitter 4, A/D change-over circuit 5, embedded single-chip computer system 6, computing machine 7, described resistance strain gage 1 by the constantan of=0.02~0.05mm turns to palisade, be fixed on the surface of the main structure of steel product of bridge bearing, one end of described resistance strain gage 1 one termination high-accuracy and constant voltage sources 2, resistance strain gage 1 other end connects high-accuracy and constant voltage source 2 other end after connecting with current detection sensor 3 forms loop, described current detection sensor 3 detects electric current in loop, described current sensor transmitter 4 is connected with current detection sensor 3, the current transformation that current detection sensor 3 is detected becomes the standard signal of 0~10mA to be input to embedded single-chip computer system 6 after A/D change-over circuit 5 carries out A/D conversion, described embedded single-chip computer system 6 is connected by telecommunication cable with computing machine 7, send data to computing machine 7.Computing machine 7 is by the variation of detection, calculated resistance foil gauge electric current, and monitoring bridge steel structure deformation extent, to avoid the generation of Bridge Accidents.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.

Claims (1)

1. a large-span steel bridge resistance-strain type safety detection device, it is characterized in that, comprise resistance strain gage (1), high-accuracy and constant voltage source (2), current detection sensor (3), current sensor transmitter (4), A/D change-over circuit (5), embedded single-chip computer system (6), computing machine (7), described resistance strain gage (1) by the constantan of=0.02~0.05mm turns to palisade, be fixed on the surface of the main structure of steel product of bridge bearing, one end of described resistance strain gage (1) one termination high-accuracy and constant voltage source (2), resistance strain gage (1) other end connects high-accuracy and constant voltage source (2) other end after connecting with current detection sensor (3) forms loop, described current detection sensor (3) detects electric current in loop, described current sensor transmitter (4) is connected with current detection sensor (3), the current transformation that current detection sensor (3) is detected becomes the standard signal of 0~10mA after A/D change-over circuit (5) carries out A/D conversion, to be input to embedded single-chip computer system (6), described embedded single-chip computer system (6) is connected by shielding type communication cable with computing machine (7), send data to computing machine (7).
CN201310327293.XA 2013-07-31 2013-07-31 Large-span steel structure bridge resistance strain type safety detection device CN103808248A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01101402A (en) * 1987-10-15 1989-04-19 Toshiba Corp Strain detecting device
CN1721813A (en) * 2004-07-14 2006-01-18 扬州泰司电子有限公司 Constant-current type static resistance strain gauge
KR20080104791A (en) * 2007-05-29 2008-12-03 한국표준과학연구원 Tensile strain measuring method and device using carbon nanotube
CN201402520Y (en) * 2009-05-14 2010-02-10 长安大学 Bridge strain collecting instrument based on wireless sensing network interface
CN202229724U (en) * 2011-08-17 2012-05-23 施杰 Resistance-type strain gauge
CN202470996U (en) * 2011-07-30 2012-10-03 代春泉 Circle deformation measurer
CN102937493A (en) * 2012-11-06 2013-02-20 昆山北极光电子科技有限公司 Measuring circuit for pressure strain gauge
CN203364755U (en) * 2013-07-31 2013-12-25 镇江市高等专科学校 Long-span steel structural bridge resistance strain type security detection device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01101402A (en) * 1987-10-15 1989-04-19 Toshiba Corp Strain detecting device
CN1721813A (en) * 2004-07-14 2006-01-18 扬州泰司电子有限公司 Constant-current type static resistance strain gauge
KR20080104791A (en) * 2007-05-29 2008-12-03 한국표준과학연구원 Tensile strain measuring method and device using carbon nanotube
CN201402520Y (en) * 2009-05-14 2010-02-10 长安大学 Bridge strain collecting instrument based on wireless sensing network interface
CN202470996U (en) * 2011-07-30 2012-10-03 代春泉 Circle deformation measurer
CN202229724U (en) * 2011-08-17 2012-05-23 施杰 Resistance-type strain gauge
CN102937493A (en) * 2012-11-06 2013-02-20 昆山北极光电子科技有限公司 Measuring circuit for pressure strain gauge
CN203364755U (en) * 2013-07-31 2013-12-25 镇江市高等专科学校 Long-span steel structural bridge resistance strain type security detection device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
于忠涛等: "《桥隧结构检测技术》", 30 September 2007, 人民交通出版社 *
李金生等: "《工程变形监测》", 28 February 2013, 武汉大学出版社 *

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Application publication date: 20140521